How did Hippocrates change Greek ideas about the causes of disease?

Hippocrates and his school were instrumental in shifting Greek medical thought away from the belief that disease was a supernatural phenomenon caused by divine disfavor or human sin. Instead, they insisted that illness was a natural occurrence with physical causes originating within the body.12

This revolutionary approach moved medicine toward a more empirical and scientific foundation. Hippocrates viewed disease with the eye of a naturalist, emphasizing the importance of clinical observation and the meticulous documentation of symptoms. He famously rejected the notion that conditions like epilepsy were "sacred" or divinely caused, arguing instead that every disease has its own nature and arises from external factors such as climate, diet, and occupation.32

By advocating for the study of the patient within their environment, Hippocrates encouraged physicians to look for logical, physical explanations for illness rather than relying on spells or prayers. This transition fostered a reliance on the body’s own ability to heal, with treatments often focusing on simple, clean living, diet, and exercise, which laid the groundwork for modern preventive medicine.123